Twain, who was spotted at a Nashville hotel on Tuesday, is expected to be a presenter at the Country Music Association Awards on Wednesday night. ABC, which is airing the awards show, has been running ads promising a buzz-worthy surprise guest.
Nashville is buzzing all right: The CMAs will mark Twain's first public appearance since the country crossover superstar, 43, announced her separation from husband Robert "Mutt" Lange, 60, in May.
Dividing her time between her native Canada and Switzerland, Twain "hasn't put down her guitar since the split," a source told PEOPLE in July. "The songs are pouring out of her."